Methods for the fabrication of polymeric fibers

Patent metadata

Field	Value
Publication number	US-9738046-B2
Application number	US-201214359005-A
Country	US
Kind code	B2
Filing date	Nov 16, 2012
Priority date	Nov 17, 2011
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

In accordance with an exemplary embodiment, a method is provided for forming a micron, submicron and/or nanometer dimension polymeric fiber. The method includes providing a stationary deposit of a polymer. The method also includes contacting a surface of the polymer to impart sufficient force in order to decouple a portion of the polymer from the contact and to fling the portion of the polymer away from the contact and from the deposit of the polymer, thereby forming a micron, submicron and/or nanometer dimension polymeric fiber.

First claim

What is claimed is:

1. A method for forming a micron, submicron or nanometer dimension polymeric fiber, the method comprising:
providing a stationary deposit of a liquid material comprising a polymer solution or a polymer melt; and
making a contact with a surface of the liquid material in the stationary deposit to impart sufficient momentary force thereto in order to:
decouple a portion of the liquid material from the deposit, and
fling the portion of the liquid material away from the contact and from the deposit of the liquid material, wherein the force is applied substantially parallel to the surface of the liquid material by a rotating structure that penetrates the stationary deposit of the liquid material during its rotation, thereby forming a micron, submicron or nanometer dimension polymeric fiber.

2. The method of claim 1 , wherein the rotating structure includes a blade and a central core, and wherein the blade is affixed to an outer surface of the central core.

3. The method of claim 2 , wherein the rotating structure penetrates the liquid material to a depth of between 1 nanometer and 1 centimeter.

4. The method of claim 2 , wherein the rotating structure rotates at a rate between 100 rpm and 500,000 rpm.

5. The method of claim 1 , further comprising:
imparting a second force to the surface of the liquid material to form a second micron, submicron or nanometer dimension polymeric fiber, wherein the first and second fibers are aligned substantially in the same direction, or wherein the first and second fibers are aligned in different directions.

6. The method of claim 1 , further comprising:
introducing a gas into the liquid material before or during the imparting of the force to the surface of the liquid material in order to facilitate formation of a meniscus.

7. The method of claim 1 , further comprising:
increasing air turbulence experienced by the fiber using one or more air blades disposed in the vicinity of the liquid material.

8. The method of claim 6 , wherein the gas is introduced by carbonation of the polymer.

9. The method of claim 1 , further comprising:
providing the stationary deposit of the liquid material before or during formation of the fiber.

10. The method of claim 9 , wherein the liquid material is provided using a micro- or macro-channel.

11. The method of claim 1 , further comprising:
collecting the polymeric fiber using a collector.

12. The method of claim 11 , wherein the collector is stationary or moveable.

13. The method of claim 1 , further comprising:
imparting a second force to the surface of the polymer to form a second micron, submicron or nanometer dimension polymeric fiber, wherein the first and second fibers are aligned in different directions.

14. The method of claim 1 , wherein the liquid material comprises a polymer solution.

15. The method of claim 1 , wherein the fiber has a diameter of between 1 nanometer and 100 microns.

16. The method of claim 1 , further comprising:
directing the fiber using a conduit that provides a pathway for the fiber.

17. The method of claim 1 , further comprising contacting the micron, submicron or nanometer dimension polymeric fiber with a plurality of living cells.

18. The method of claim 17 , wherein the living cells are selected from the group consisting of muscle cells, neuron cells, endothelial cells, and epithelial cells, or a combination thereof.

19. The method of claim 18 , wherein the living cells are cultured such that a living tissue is produced.

20. The method of claim 1 , further comprising contacting the micron, submicron or nanometer dimension polymeric fiber with a biologically active agent.

21. The method of claim 1 , wherein the micron, submicron or nanometer dimension polymeric fiber is treated with a pharmaceutically active agent.

22. The method of claim 1 , wherein the liquid material is mixed with living cells during formation of the polymer fiber to produce cell-encapsulated fibers.

23. The method of claim 1 , wherein the liquid material further comprises a biologically active agent selected from the group consisting of proteins, nucleotides, lipids, drugs, pharmaceutically active agents, biocidal, and antimicrobial agents.

24. The method of claim 1 , wherein the surface penetrating by the rotating structure is a free surface of the liquid material.

Assignees

• Harvard College

Inventors

• Parker Kevin Kit
• Badrossamay Mohammad Reza
• Goss Josue Adrian

Classifications

• B29D99/0078 Primary

  Producing filamentary materials · CPC title

• D01D5/0985

  by means of a flowing gas (e.g. melt-blowing) · CPC title

• D01F6/625

  derived from hydroxy-carboxylic acids, e.g. lactones · CPC title

• Y10T428/249921

  Web or sheet containing structurally defined element or component · CPC title

• D01D5/18

  by means of rotating spinnerets · CPC title